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z in (-oo:+oo)
-z/2 = 12/6 // - 12/6
-z/2-(12/6) = 0
-z/2-2 = 0
-1/2*z-2 = 0 // + 2
-1/2*z = 2 // : -1/2
z = 2/(-1/2)
z = -4
z = -4
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